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http://dx.doi.org/10.5762/KAIS.2019.20.4.86

Synthesis and Characterization of Polymers with Azobenzene and Hexamethylene Groups in Main Chain  

Gu, Su-Jin (Division of Advanced Materials Science and Engineering, Kongju National University)
Lee, Eung-Jae (Department of Bioenvironmental & Chemical Engineering, Chosun College of Science & Technology)
Bang, Moon-Soo (Division of Advanced Materials Science and Engineering, Kongju National University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.20, no.4, 2019 , pp. 86-92 More about this Journal
Abstract
Polymers with various compositions of azobenzene and hexamethylene groups in the main chain were synthesized by a Schotten-Baumann reaction and their properties were investigated. The chemical structures and physical properties of the synthesized polymers were investigated by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, differential scanning calorimetry, thermogravimetric analysis, polarized optical microscopy, and x-ray diffraction. The polymers showed an inherent viscosity of 1.28-1.36 dl/g and were relatively insoluble in most organic solvents. The melt transition temperature increased rapidly with increasing number of azobenzene groups in the polymer. When the azobenzene monomer content was more than 50 mol%, no melting transition occurred below the decomposition temperature. Among the polymers with a melt transition temperature, the MP-A3C7 and MP-A5C5 polymers were liquid crystalline materials and exhibited a nematic phase with weak liquid crystallinity over a wide liquid crystal temperature range. This difference in the properties of the synthesized polymers is likely due to the changes in intermolecular forces resulting from the linearity and polarity of the trans-form of azobenzene.
Keywords
Azobene; Main-Chain LCP; Mesogenic; Methylene Spacer; Nematic;
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1 Y. Yu, M. Nakano, T. Ikeda, "Photoinduced bending and unbending behavior of liquid-crystalline gels and elastomers", Pure Appl. Chem., vol. 76, pp. 1467-1477, 2004. DOI: https://doi.org/10.1351/pac200476071467   DOI
2 H. Finkelmann, E. Nishikawa, G. G. Pereira, M. Warner, "A new opto-mechanical effect in solids", Phys. Rev. Lett., vol. 87, p. 015501, 2001. DOI: https://doi.org/10.1103/physrevlett.87.015501   DOI
3 M. Z. Alam, A. Shibahara, T. Ogata, S. Kurihara, "Synthesis of azobenzene-functionalized star polymers via RAFT and their photoresponsive properties", Polymer, vol. 52, pp. 3696-3703, 2011. DOI: https://doi.org/10.1016/j.polymer.2011.06.035   DOI
4 Y. W. Kwon, D. H. Choi, J. I. Jin, "Liquid crystalline aromatic polyesters", Polymer (Korea), vol. 29, pp. 523-535, 2005.
5 D. Y. Kim, "Main chain liquid crystalline polymers", Polymer Science and Technology, vol. 2, pp. 415-423, 1991.
6 H. Finkelmann, G. Rehage, "Investigations on liquid crystalline polysiloxanes, 2. Optical properties of cholesteric phase and influence of the flexible spacer on the mobility of the mesogenic group", Macromol. Chem. Rapid Commun., vol. 1, pp. 733-740, 1980. DOI: https://doi.org/10.1002/marc.1980.030011206   DOI
7 B. Reck, H. Ringsdorf, "Combined liquid-crystalline polymers: rigid rod and semi-flexible main chain polyesters with lateral mesogenic groups", Macromol Rapid Commun. vol. 7, pp. 389-396, 1986. DOI: https://doi.org/10.1002/marc.1986.030070612   DOI
8 R. Zentel, M. Brehmer, "Combined LC main chain/side chain polymers", Acta Polymer, vol. 47, pp. 141-149, 1996. DOI: https://doi.org/10.1002/actp.1996.010470402   DOI
9 E. Merino, "Synthesis of azobenzenes: the coloured pieces of molecular materials", Chem. Soc. Rev., vol. 40, pp. 3835-3853, 2011. DOI: https://doi.org/10.1039/c0cs00183j   DOI
10 J. R. Park, S. J. Gu, D. S. Yoon, M. S. Bang, J. K. Choi, "Synthesis and properties of symmetrical diazomesogenic liquid crystal compounds with terminal substituents", Appl. Chem. Eng., vol. 26, pp. 698-705, 2015. DOI: http://dx.doi.org/10.14478/ace.2015.1100   DOI
11 S. Alazaroaie, V. Toader, I. Carlescu, K. Kazmierski, D. Scutaru, N. Hurduc, C. I. Simionescu, "Liquid crystalline polymers 14. Synthesis and thermal behaviour of some polyethers containing azo-mesogens", Eur. Polym. J., vol. 39, pp. 1333-1339, 2003. DOI: https://doi.org/10.1016/S0014-3057(03)00002-8   DOI
12 N. Tamaoki, Y. Aoki, M. Moriyama, M. Kidowaki, "Photochemical phase transition and molecular realignment of glass-forming liquid crystals containing cholesterol/azobenzene dimesogenic compounds", Chem. Mater., vol. 15, pp. 719-726, 2003. DOI: https://doi.org/10.1021/cm020234c   DOI
13 H. J. Kim, "Effect of the position of azobenzene moiety on the light-driven anisotropic actuating behavior of polyvinylalcohol polymer blend films", Appl. Chem. Eng., vol. 23, pp. 65-70, 2012.
14 J. R. Park, "Synthesis and properties of cholesteric liquid crystalline polysiloxanes with paired mesogenic groups", Master's Thesis, Kongju University, 2016.
15 X. L. Piao, J. S. Kim, Y. K. Yun, J. I. Jin, "Combined type liquid crystalline polymers composed of poly(p-phenylene terephthalate) main chain and azobenzene mesogenic side groups attached through polymethylene spacers", Macromolecules, vol. 30, pp. 2294-2299, 1997. DOI: https://doi.org/10.1021/ma961649k   DOI
16 O. M. Tanchak, C. J. Barrett, "Light-induced reversible volume changes in thin films of azo polymers: The photomechanical effect", Macromolecules, vol. 38, pp. 10566-10570, 2005. DOI: https://doi.org/10.1021/ma051564w   DOI
17 Y. Yu, M. Nakano, "Directed bending of a polymer film by light", Nature, vol. 425, pp. 145-145, 2003. DOI: https://doi.org/10.1038/425145a   DOI